This document is one of three modules that are intended to support consultants in infant and toddler child care environments. This module contains an overview of infant/toddler development and caregiver involvement, describes the observation, screening and ongoing assessment process, and discusses the red flags and referrals in atypical child development. Each section is accompanied by worksheets or activities. Useful information regarding developmental milestones and screening and assessment tools are appended at the end of the paper.